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Old 22 April 2011, 02:11   #1
8bitbubsy
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Identifying how many megs a RAM stick has

I have a box full of old EDO RAM sticks, and I want to identify how many megs each of them are without the good old "insert into a machine and check" trick. Almost none of them have size on the stickers.
How can I do this? I guess I have to count how many chips it has got and interpret from the chip ID? I have no clue how I am supposed to "read" the chip ID...
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Old 22 April 2011, 02:23   #2
prowler
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At this site you can just enter the RAM chip part numbers to find out the manufacturer and specifications:
http://www.chipmunk.nl/DRAM/ChipManufacturers.htm
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Old 22 April 2011, 03:29   #3
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I just google any reference found on the pcb of the stick, always find the specs on some site
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Old 22 April 2011, 04:51   #4
8bitbubsy
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Well, many of my RAM sticks doesn't even have any serials or "brand" on it... Just on the ICs themselves.
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Old 22 April 2011, 07:06   #5
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each IC have name - own unique number - search for IC - capacity of module will be direct capacity of all chips - short modules are 8 bit (+sometimes parity bit however it is not important) long 32 bits (4 bits parity sometimes - can be used to store additional data if parity not used but usually are not used)
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Old 22 April 2011, 08:40   #6
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Part numbers will give you data capacity but not ram geometry, I will be honest here, I cheat, I have a ram tester.

http://en.wikipedia.org/wiki/Memory_geometry

I haven't done the sums and technology changes all the time, confusing terms and no standards, I love the computer industry.
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Old 22 April 2011, 13:22   #7
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This has come in handy over the years:

http://jope.fi/conversionchart.htm

I pilfered it from some site that has long since disappeared.
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Old 22 April 2011, 23:09   #8
pandy71
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Quote:
Originally Posted by Loedown View Post
Part numbers will give you data capacity but not ram geometry, I will be honest here, I cheat, I have a ram tester.

http://en.wikipedia.org/wiki/Memory_geometry

I haven't done the sums and technology changes all the time, confusing terms and no standards, I love the computer industry.

Oh no, lot of modules are easy to discover only based on memory chips (size, organization, amount) - industry standarized this quite well - only rare modules for non-PC's, servers can b different.
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